Some time this month, I will be adding an SSD. I also want to add another hard drive. After I add the SSD, I will have 4 additional drives: 2 @ 750GB, 1@1TB, & 1@80GB. The 80 is coming out and I would like a fairly fast drive to replace it. I don't need a 10K RPM drive, but just didn't want to pick a green drive or some other drive that will be the slowest one in the set. BTW, I will not be using any of them in a raid array and this will be in a Windows 7-64 box.